Hello all,
We are confused. Let me see if I can explain correctly. We have a 2015 Southwind. Our batteries do not make it through the night. We have checked and have made sure everything is turned off at night except the refrigerator, which is a Samsung residential, so we cannot turn it off. The Magnum shows we are drawing 5 to 7 A at night. We have two battery systems, an auxiliary system and a main system. We have determined that the refrigerator runs off the auxiliary system, which is the system that runs off the inverter. Before morning, we get a low battery alarm which shuts off the inverter, which in turn shuts off the refrigerator. The problem is that the auxiliary side shuts down first while the main is still at 12.5 V. So we get a low battery alarm which shuts off the inverter and everything that runs off of it. We understand that the low battery alarm is triggered by the battery with the lowest charge.

We have a four battery system under the stairs that are all linked together. Could we have a bad battery in the four battery group? Which batteries are which? How can we tell which batteries are the auxiliary batteries and which batteries are the main batteries?

We should be able to make it through the night. We run the generator for a couple hours before we go to bed and make sure both battery systems are charged to 12.5.

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We have a four battery system under the stairs that are all linked together. Could we have a bad battery in the four battery group? Which batteries are which? How can we tell which batteries are the auxiliary batteries and which batteries are the main batteries?
We should be able to make it through the night. We run the generator for a couple hours before we go to bed and make sure both battery systems are charged to 12.5.
.

If all the batteries are linked , chances are they are your , coach ( house) batteries. Are they all 6V batteries ? Three caps per battery?
Could you post a picture?
Chances are you have found the coach batteries, and haven't found the chassis, ( engine start , main ) batteries yet.

What I would do is to charge the batteries fully then disconnect them. Check the voltage of each battery individually. Each battery should have 6.2 volts or higher. If one tests around 4 volts you have a bad cell which can draw down the good batteries. I would suspect you have a defective battery which is probably covered under the warranty. Not common these days but it does happen.
Lynn

Beside running the generator a couple of hours during the night, do you run it any other time or have solar charging?

You may have bad batteries due to dealer abuse but could also need to charge them more then you are.

The Magnum says 7 amps at night. Is that with the fridge running? My small fridge uses 9 or 10 amps DC while running about 1/2 the time. If you draw 7 amps constant plus 10 amps, 1/2 the time, that will add up to a lot of battery capacity ( 240 AH ) over a 20 hour period. That's about all you have to use.

Many boondockers run the generator 2 to 3 hours in the morning and then again the same in the evening.

If you use 240 AH of battery and charge at 50 amps, that is over 6 hours of generator time, covering the losses in charging.

You should do an energy audit. You have all of the info you need to do one.

You also mention charging to 12.5. You need to charge up to at least 14.2 to get to the bulk charge of about 80% capacity.